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  2. Hard water - Wikipedia

    en.wikipedia.org/wiki/Hard_water

    A bathtub faucet with built-up calcification from hard water in Southern Arizona. Hard water is water that has a high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, [1] which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

  3. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes

  4. HSAB theory - Wikipedia

    en.wikipedia.org/wiki/HSAB_theory

    Some examples illustrating the effectiveness of the theory: Bulk metals are soft acids and are poisoned by soft bases such as phosphines and sulfides. Hard solvents such as hydrogen fluoride, water and the protic solvents tend to dissolve strong solute bases such as fluoride and oxide anions.

  5. How To Remove Hard Water Stains in Your Kitchen and ... - AOL

    www.aol.com/news/remove-hard-water-stains...

    Whether you’ve got hard water stains on your dishware or in your bathroom, we’ve rounded up some of the best solutions for removing residue.

  6. The 7 Best Laundry Detergents for Hard Water - AOL

    www.aol.com/entertainment/7-best-laundry...

    First up on our list of the 7 best laundry detergent for hard water is Loni Bio Laundry Detergent. This fragrance free option comes in a 75 washer load option that uses natural ingredients and ...

  7. Mineral spring - Wikipedia

    en.wikipedia.org/wiki/Mineral_spring

    Mineral springs are naturally occurring springs that produce hard water, water that contains dissolved minerals. Salts, sulfur compounds, and gases are among the substances that can be dissolved in the spring water during its passage underground. In this they are unlike sweet springs, which produce soft water with no noticeable dissolved gasses ...